convention for power supply routing

Is there anything in the NEC that says that the wire supplying a panel, switch, or component should come in to the top of said panel, switch, or component? And also that the power leaving any device or panel should come out the bottom? Is this an actual convention? Are there exceptions or workarounds?
Thanks, laylow
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Laylow writes:

Electricity doesn't flow uphill.
Wait ... No, I'm confusing it with water.
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supplying a

said panel,

device or

convention? Are

No, don 't think so. You have to check with your local code enforcement anyway, so ask them while you're at it.
<feeling facetious> I'll bet you'll be back later too, asking whether the third prong on a 3-wire outle goes on top or on the bottom <g>. When you get that one answered, then think about which way it goes if it's mounted horizontally. </feeling facetious>
There IS something somewhere though, union I think, or maybe industrial, that says input's always on top, output's on the bottom. Perhaps that's where the question comes from? It is a convention, but in new construction it's pretty easy to do stuff anyway they want to for convention. So, it IS possible a local code calls for it but I've never heard it mentioned.
Pop
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Lotta words....no useful information.

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It doesn't matter if the feed or load enters or exists the enclosures from the top bottom or sides . As far as panels go they com in many different configurations with lugs o top or bottom or sometimes on the sides. Now disconnect switches are different. We always feed vertical mounted disconnect switches on the top and take the loads off the bottom unless the switch is marked differently. I think is a throw back to the days when these types of switches were knife switches and you wired them so that the blades were not live when the switch was open. If you are asking about everyday panels .switches and devices found around the home then it really doesn't matter (except disconnect switches ) Unless you give more specific info what I said is more practice than code.
Bill
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| Is there anything in the NEC that says that the wire supplying a | panel, switch, or component should come in to the top of said panel, | switch, or component? And also that the power leaving any device or | panel should come out the bottom? Is this an actual convention? Are | there exceptions or workarounds?
Power coming it at the bottom and leaving from everywhich direction is actually rather common. The Square-D I-Line series commercial breaker panels are designed with this assumption.
One restriction to deal with is the NEC requirement that when a switch or breaker handle operates in a vertical orientation, then UP must be ON (closed) and DOWN must be OFF (open). Horizontal can go either way. if you have a panel with any breakers (typically main) operating in the vertical orientation, and want to invert their direction, you need to change the affected breakers so they retain the correct direction. That could mean reversing the mounting of a breaker inside and maybe feeding it backwards.
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Most sparkies follow what you have mentioned. There are acceptations to every practice. The biggest problem with bottom feeding some switches is that when open the knives are hot. Pretty cool at 5 kv, yep I found one of these at a university. There are machines where this practice is not followed.
There are bottom fed circuit breaker panels by every manufacture.
Be more specific about your application or talk to the AHJ
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